Liquid evaporating apparatus



y 22, 1956 SHINZO SUMIYA LIQUID EVAPORATING APPARATUS Filed April 14. 1952 2 Sheets-Sheet 1 CAM 1%) 1Cyl 31 Fig.1

IN VEN TOR.

y 1956 SHINZO SUMIYA 2,746,536

LIQUID EVAPORATING APPARATUS Filed April 14, 1952 2 She ets-Sheet 2 Fig.6

United States "Patent LIQUID EVAPORATING APPARATUS Shinzo Sumiya, Takaishicho, Senbokugnn, Japan Application April 14, 1952, Serial No. 282,115

Claims priority, application Japan April 18, 1951 4 Claims. (Cl. 159-47) This invention relates to apparatus forthe concentration of various liquid materials. The object of the invention is to increase the quantity of liquid material being evaporated by a simple reconstruction of the apparatus and with a small increase of floor space occupied thereby.

According to the present invention, liquid material is circulated through upper and lower circulation pipes connecting separating vessels. Heaters are positioned between the upper and lower pipes. The separating vessels are arranged at intervals of several heaters. The heaters may stand side by side along one or both sides of the said pipes. 'It is very simple to increase the number. of heaters and separating vessels by extending the said circulation pipes, so that the increase of quantity of liquid material being evaporated may be easily increased. This has heretofore been done by providing one or more additional evaporating apparatus. 'According to the invention it may now be accomplished with little expense and a small increase of floor space.

One form of the invention is illustrated in the accompanying drawing of a single stage evaporating apparatus, in which Figure 1 is a front viewof the apparatus; Figure 2, a plan view of the apparatus, the heaters of which are arranged along one side of the upper and lower circulation pipes; Figure 3, a plan 'view of the apparatus, the heaters of which are arranged along both sides of the said pipes; Figs. 4, 5 and 6 are a plan view, a side elevation and an end elevation of a detail of the separator and condenser.

Heaters 1 having a plurality of heating tubes 2 are placed side by side in parallel. Separating vessels Sam positioned at intervals between groups of several heaters 1, there being at least one more heater than separators per group. The upper end of the heaters 1 are connected with an upper circulation pipe 4 which is connected to the lower part of each separating vessel 3. The lower ends of heaters 1 are connected with a'lower circulation pipe 5 connected to the bottom of each separating vessel 3. Thus the separators are connected in parallel with the group of heaters and the separators on each side of them, and each group of heaters is connected in parallel with the separator on each of its ends. The liquid material being evaporated flows from a pipe 6 into lower circulation pipe 5 and is caused to pass through the heating tubes 2 of heaters 1. These are heated by live steam introduced to heaters 1 through pipe 7. The liquid being treated is flashed through upper circulation pipe 4 to the nearest separator and is separated from the generated vapor. Liquid which is not vaporized returns to lower circulation pipe 5 and is heated again in any heater 1. While the vapors generated in heaters 1 pass through the upper circulation pipe 4, they are almost completely separated from the entrain- "ment of the liquid material.

the separators 3, the steam through pipe 8 to condenser 2,746,536 Patented May 22, 1956 They then pass into one of 9, into which condensing water is introduced through pipe 10. The condenser is connected by pipe 11 with a vacuum pump, not shown. The condensate with the cooling wateris discharged through pipe 12 from condenser 9. The liquid material, concentrated to a predetermined degree during its circulation, flows out from one of separating vessels 3 through pipe 13 via downtake 5, transfer conduit 13' and decanter 16. Stabilizer pipe 17 connects the top of decanter 16 to the vapor space within separator 3. Pipe 14 connects the upper circulation pipe 4 and the lower circulation pipe 5, to help the circulation of the boiling liquid at a distance from any separating vessel 3. The ends of the upper circulation pipe 4 and the lower circulation pipe 5 can be easily extended. They Ymay connect heaters arranged side by side to one or both sides of the plane of said pipes, and may connect with separating vessels at intervals of at least three heaters, thus forming groups of heaters connected in parallel which in turn are connected in parallel with a separator at each end of the group.

It is thought that the invention and its advantages will be understood from the foregoing description and it is apparent that various changes may be made in the form, construction and arrangement of the parts without depart= ing from the spirit and scope of the invention or sacrificing its material advantages, the forms hereinbefore ,described and illustrated in the drawings being merely preferred embodiments thereof.

1. An evaporator comprising a plurality of groups of at least three heaters, a plurality of separators positioned one between each pair of adjacent groups of heaters, an

being connected in parallel between said upper and lower circulation pipes, means in said lower circulation pipe to admit a liquid to be evaporated into said lower circulation pipe and the heaters, means to introduce steam to said heaters, means to withdraw concentrated liquid material from said separators, and means to withdraw vapor from said separators.

2. An evaporator as claimed in claim 1 in which each group of heaters comprises a plurality of heaters arranged on one side of the plane of said upper and lower circulation pipes.

3. An evaporator as claimed in claim 1 in which each group of heaters comprises a plurality of heaters arranged on both sides of the plane of said upper and lower circulation pipe. I v p 4. An apparatus as claimed in claim 1 and a connecting pipe joining said upper and lower circulation pipes at a distance fixed between two of said separators.

References Cited in the file of this patent UNITED STATES PATENTS France Nov. 9, 1923 

1. AN EVAPORATOR COMPRISING A PLURALITY OF GROUPS OF AT LEAST THREE HEATERS, A PLURALITY OF SEPARATORS POSITIONED ONE BETWEEN EACH PAIR OF ADJACENT GROUPS OF HEATERS, AN UPPER CIRCULATION PIPE AND A LOWER CIRCULATION PIPE CONNECTING SAID SEPARATORS IN PARALLEL, SAID GROUPS OF HEATERS BEING CONNECTED IN PARALLES BETWEEN SAID UPPER AND LOWER 